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1 Various progress in Zµ + µ - EWK Dilepton meeting, 23.11.2010 Arie Bodek, Yeonsei Chung, Jiyeon Han Rochester University Alessio Bonato, Andrei Gritsan, Zijin Guo, Nhan Tran* Johns Hopkins University

Various progress in Z µ + µ -

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Various progress in Z µ + µ -. EWK Dilepton meeting, 23.11.2010 Arie Bodek, Yeonsei Chung, Jiyeon Han Rochester University Alessio Bonato, Andrei Gritsan, Zijin Guo, Nhan Tran* Johns Hopkins University. Outline. A first look at MC and Data in CMS Features, comparison, implications - PowerPoint PPT Presentation

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Page 1: Various progress in Z µ + µ -

1

Various progress in Zµ+µ-

EWK Dilepton meeting, 23.11.2010

Arie Bodek, Yeonsei Chung, Jiyeon Han Rochester University

Alessio Bonato, Andrei Gritsan, Zijin Guo, Nhan Tran*

Johns Hopkins University

Page 2: Various progress in Z µ + µ -

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Outline

• A first look at MC and Data in CMS• Features, comparison, implications

• Implications for analyses of Afb and sin2W• Plans and progress in Afb with event weighting

http://indico.cern.ch/conferenceDisplay.py?confId=112949 (N.T.)

• Plans and progress in sin2W with likelihood methodhttp://indico.cern.ch/conferenceDisplay.py?confId=113453 (A.

Gritsan)

A report on various activities related to Zµ+µ-

http://indico.cern.ch/conferenceDisplay.py?confId=112949
http://indico.cern.ch/conferenceDisplay.py?confId=113453
Page 3: Various progress in Z µ + µ -

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Data/MC: Kinematic distributions

MC: /DYToMuMu_M-20_CT10_TuneZ2_7TeV-powheg-pythia/Fall10-START38_V12-v1

data: 35 pb-1

Basic plots match those shown elsewhere with reasonable agreement

Page 4: Various progress in Z µ + µ -

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More MC plots

Interesting acceptance effect

resolutionresolution vs. eta

Page 5: Various progress in Z µ + µ -

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Afb in MC

Full Y range 1 < |Y| < 2

Effect seen last time…

Forward-backward asymmetry switches sign near Z peakMore severe at greater Y

Page 6: Various progress in Z µ + µ -

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Resolution and binningLet’s look at one specific mass bin…

Resolution with right-side tail, “artificial” due to binning

Reason for Afb sign flip

Page 7: Various progress in Z µ + µ -

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Implications for event weighting Afb

• Resolution/FSR and bin migration effects large (could increase bin size)

• Solution: need to account for by including in weighting tables; FSR and “fast smear” at generator level, need to implement negative weighting

raw Afb

Event weighting for

dilution

weighted Afb

Pull corrections for

detector effects

measured Afb

raw Afb

Event weighting for dilution,

FSR, resolution

weighted Afb

Pull corrections for

remaining effects

measured Afb

Reminder of the strategy:

Change strategy:

Page 8: Various progress in Z µ + µ -

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ResolutionResolution effects need to be understood for both likelihood technique (resolution convolution) and event weighting technique

(fast smear for weighting)

Fit with double Gaussian for both m and m2

resolution - technical reasons due to analytical convolution in likelihood

approach

Page 9: Various progress in Z µ + µ -

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AcceptanceFlat acceptance not a good model, lose events

at larger Gen level (flat acceptance, ||<2.1), Reco level (||<2.1)

Parametrize acceptance with polynomial fit (acceptance function)

Page 10: Various progress in Z µ + µ -

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Implication for likelihood analysis

• Recall, likelihood function over 3 observables (m,Y,cos) used in angular analysis and fitting of Weinberg angle, sin2W.

• Analytical description involving• Parton-level cross-section• Parton distribution functions• Dilution• Acceptance - flat acceptance• Resolution - Gaussian smearing (No FSR)

• Implement more realistic modeling of detector effects using MC for acceptance and resolution

Page 11: Various progress in Z µ + µ -

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Resolution and acceptance

1D projections with flat acceptance and Gaussian smearing

Now, implementing realistic resolution and acceptance

*Fit under study

Y mcos


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